java - 如何在首选项之前显示加载屏幕类 [Libgdx & android]

Question

所以我正在编写一个游戏，并实现了偏好来保存/加载一些简单的声音/高分数据，没有太多。问题是，当我第一次在物理手机(三星 g.s3)上加载首选项时，它需要大约 15 秒，而在 s5 上它需要大约 5-8 秒，并且在那个时候它显示黑屏，即使我已经设置了加载在使用首选项之前首先显示屏幕。

在我的主应用程序代码中，我将屏幕设置为 loadingScreen

loadingScreen = new com.package.game.Screens.LoadingScreen(this);
mainScreen = new com.package.game.Screens.MainScreen(this);
gameScreen = new com.package.game.Screens.GameScreen(this);
settingsScreen = new com.package.game.Screens.SettingsScreen(this);
this.setScreen(loadingScreen);

然后在我的加载屏幕中访问首选项:

@Override
public void show() {
    this.progress_assets = 0f;
    this.progress_assets = 0f;
    font_loading = app.initFont(50, 1, 255, 255, 255, 1);


    queueAssets();

    loading_db();
}

private void loading_db() {
    if(database.get_first_time()){
        //do some introduction for first time run
        Gdx.app.log("db","first time worked");
        database.set_first_time();
        progress_db=1f;
    }else{
        Gdx.app.log("db","first time is set false");
        progress_db=1f;
    }
}

和我的偏好类:

 package com.package.game.Engine;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Preferences;
 import com.package.game.Application;

 public class Database {
private Preferences preferences;
//database
private Preferences pref_settings;
private Preferences pref_score;
private Preferences pref_unlocks;
public Database(){
        pref_settings = Gdx.app.getPreferences("com.package.game.settings");
        pref_score = Gdx.app.getPreferences("com.package.game.score");
        pref_unlocks = Gdx.app.getPreferences("com.package.game.unlocks");

}


//checking if first time run
public boolean get_first_time(){
    return pref_settings.getBoolean("First_run",true);

}
public void set_first_time(){
    pref_settings.putBoolean("First_run",false);
    for(int i=0;i<7;i++){
       pref_unlocks.putBoolean("unlock_"+i,true);
    }
    pref_unlocks.flush();
    pref_settings.flush();
}
//settings
public boolean getSound(){
        return pref_settings.getBoolean("sound_on",true);
}
public void setSound(boolean sound){
    pref_settings.putBoolean("sound_on",sound);
    pref_settings.flush();
}
//High Score Mode:
//Classic
public int getScore_classic(int place){
    return pref_score.getInteger("score_classic_"+place,0);//default value 0 so we could place new score if we havent reached it
}
public void setScore_classic(int place,int scored){
    pref_score.putInteger("score_classic_"+place,scored);
    pref_score.flush();
}
//Recipe
public int getScoreRec(int place){

    return pref_score.getInteger("score_recipe_"+place,0);//default value 0 so we could place new score if we havent reached it
}
public void setScoreRec(int place,int scored){

    pref_score.putInteger("score_recipe_"+place,scored);
    pref_score.flush();
}
//food unlocks
public boolean getFoodUnlock(int unlockID){
    return pref_unlocks.getBoolean("unlock_"+unlockID,false);
}
public void setFoodUnlock(int unlockID,boolean state){
    pref_unlocks.putBoolean("unlock_"+unlockID,state);
    pref_unlocks.flush();
}
}

我不确定是否创建 3 pref。文件很好，但我想知道如何在 pref 之前显示屏幕。正在创建/加载文件。

编辑:添加我的主要代码

package com.mindutis.game;

import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Preferences;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.utils.viewport.ExtendViewport;
import com.mindutis.game.Screens.LoadingScreen;

public class Application extends Game {
public static  int V_WIDTH ;
public static  int V_HEIGHT;

public OrthographicCamera camera;
public SpriteBatch batch;

public AssetManager assets;
public com.mindutis.game.Screens.LoadingScreen loadingScreen;
public com.mindutis.game.Screens.SplashScreen splashScreen;
public com.mindutis.game.Screens.MainScreen mainScreen;
public com.mindutis.game.Screens.GameScreen gameScreen;
public com.mindutis.game.Screens.SettingsScreen settingsScreen;
public BitmapFont f_game_name;
public String t_game_name;
public String[] font_type = new String[2];
private boolean firstFrame = true;
private boolean loading = true;



@Override
public void create() {

    assets = new AssetManager();
    camera = new OrthographicCamera();
    V_WIDTH= Gdx.graphics.getWidth();
    V_HEIGHT = Gdx.graphics.getHeight();
    camera.setToOrtho(false, V_WIDTH, V_HEIGHT);
    batch = new SpriteBatch();

    //Global var.
    //font initializer
    font_type[0] = "fonts/comics_bold.ttf";
    font_type[1] = "fonts/vdj.ttf";
    //game name
    t_game_name = " Catch a\nSandwich";
    f_game_name = initFont(70, 0, 255, 255, 255, 1);


    loadingScreen = new com.mindutis.game.Screens.LoadingScreen(this);
    splashScreen = new com.mindutis.game.Screens.SplashScreen(this);
    mainScreen = new com.mindutis.game.Screens.MainScreen(this);
    gameScreen = new com.mindutis.game.Screens.GameScreen(this);
    settingsScreen = new com.mindutis.game.Screens.SettingsScreen(this);


 //   this.setScreen(loadingScreen);
}

//int size=font size, int x = font type
public BitmapFont initFont(int size, int type, float red, float green, float blue, float alpha) {
    BitmapFont font;
    FreeTypeFontGenerator generator = new FreeTypeFontGenerator(Gdx.files.internal(font_type[type]));
    FreeTypeFontGenerator.FreeTypeFontParameter parameter = new FreeTypeFontGenerator.FreeTypeFontParameter();
    parameter.size = size;
    font = generator.generateFont(parameter);
    font.setColor(red / 255f, green / 255f, blue / 255f, alpha);
    return font;
}

@Override
public void render() {
    if (firstFrame){
        Gdx.gl.glClearColor(.2f, .67f, .88f, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        f_game_name.draw(batch, t_game_name, camera.viewportWidth / 2 - 150, camera.viewportHeight - 100);
        batch.end();
        firstFrame = false;
    } else {
       if(loading){
           loading=false;
           loadEverything();
       }
        // Notice you don't actually render anything so what you previously drew stays on the screen.

       }
    super.render();

}
private void loadEverything(){
    // load your font, assets, prefs, etc.

    this.setScreen(loadingScreen);
   // setScreen(loadingScreen);
}
@Override
public void dispose() {
    batch.dispose();
    assets.dispose();
    f_game_name.dispose();
    loadingScreen.dispose();
    splashScreen.dispose();
    mainScreen.dispose();
    gameScreen.dispose();
    settingsScreen.dispose();

}

}

加载屏幕类:

package com.mindutis.game.Screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.utils.viewport.FitViewport;
import com.mindutis.game.Application;
import com.mindutis.game.Engine.Database;

public class LoadingScreen implements Screen {

private final Application app;
private Database database;
private BitmapFont font_loading;
private boolean load;
private ShapeRenderer shapeRenderer;
private Stage stage;

private String t_loading;
private float progress_assets,progress_db;


private boolean firstFrame = true;
private boolean loading = true;

public LoadingScreen(Application app) {
    this.app = app;
    database = new Database();
    this.stage = new Stage(new FitViewport(com.mindutis.game.Application.V_WIDTH, com.mindutis.game.Application.V_HEIGHT, app.camera));
    this.shapeRenderer = new ShapeRenderer();
    t_loading = "Loading...";
load=false;

}

private void queueAssets() {
    //good food
    //bread
    app.assets.load("img/Food/breadtop.png", Texture.class);

    app.assets.load("img/Food/breadbot.png", Texture.class);
    //rest of the food
    app.assets.load("img/Food/food_sheet.png", Texture.class);
      //misc
    app.assets.load("img/Misc/coin.png", Texture.class);
   app.assets.load("img/Misc/soon.png", Texture.class);
       app.assets.load("img/Misc/shoptriangle.png", Texture.class);
     //buttons
    app.assets.load("img/Buttons/button.png", Texture.class);
     app.assets.load("img/Buttons/soundBT.png", Texture.class);
     app.assets.load("img/Buttons/btX.png", Texture.class);
      app.assets.load("img/Buttons/btShop1.png", Texture.class);
    //human
    app.assets.load("img/Human/human.png", Texture.class);
     app.assets.load("img/Human/human1.png", Texture.class);
       app.assets.load("img/Human/human2.png", Texture.class);


}

@Override
public void show() {
    this.progress_assets = 0f;
    this.progress_assets = 0f;
    font_loading = app.initFont(50, 1, 255, 255, 255, 1);


    queueAssets();

    loading_db();
}

private void loading_db() {
    if(database.get_first_time()){
        //do some introduction for first time run
        Gdx.app.log("db","first time worked");
        database.set_first_time();
        progress_db=1f;
    }else{
        Gdx.app.log("db","first time is set false");
        progress_db=1f;
    }
}

@Override
public void render(float delta) {
    if (firstFrame){
        Gdx.gl.glClearColor(.2f, .67f, .88f, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        app.batch.begin();
        app.f_game_name.draw(app.batch, app.t_game_name, app.camera.viewportWidth / 2 - 150, app.camera.viewportHeight - 100);
        app.batch.end();
        firstFrame = false;
    } else {
        if(loading){
            loading=false;}
             //input
            Gdx.input.setCatchBackKey(true);
            Gdx.input.setInputProcessor(new InputAdapter() {
                @Override
                public boolean keyDown(int keycode) {
                    if (keycode == Input.Keys.BACK) {
                        // Do nothing
                    }
                    return false;
                }
            });
            Gdx.gl.glClearColor(.2f, .67f, .88f, 1);
            Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

            update(delta);

            app.batch.begin();
            font_loading.draw(app.batch, t_loading, app.camera.viewportWidth / 2 - 150, 123);
            app.f_game_name.draw(app.batch, app.t_game_name, app.camera.viewportWidth / 2 - 150, app.camera.viewportHeight - 100);
            app.batch.end();

            shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
            shapeRenderer.setColor(Color.WHITE);
            shapeRenderer.rect(32, 50, app.camera.viewportWidth - 64, 16);

            shapeRenderer.setColor(Color.GREEN);
            shapeRenderer.rect(32, 50, (progress_assets+progress_db)/2 * (app.camera.viewportWidth - 64), 16);
            shapeRenderer.end();

        }
        // Notice you don't actually render anything so what you previously drew stays on the screen.

    }






private void update(float delta) {
    progress_assets = MathUtils.lerp(progress_assets, app.assets.getProgress(), .1f);
    if (app.assets.update() && (progress_assets+progress_db)/2 >= app.assets.getProgress() - .01f) {

        app.setScreen(app.mainScreen);
    }
}

@Override
public void resize(int width, int height) {
    stage.getViewport().update(width, height, false);
}

@Override
public void pause() {

}

@Override
public void resume() {

}

@Override
public void hide() {

}

@Override
public void dispose() {

    shapeRenderer.dispose();
    font_loading.dispose();
    stage.dispose();

}
}

Answer 1

您可以快速加载单个纹理以在加载其他所有内容时显示。第一次调用 render() 时加载并显示纹理。然后第二次调用 render()，加载你的东西，处理纹理，切换屏幕。

public class LoadingScreen extends Screen {

    private boolean firstFrame = true;
    private Texture texture;
    private ExtendViewport viewport;
    private MyGame game;
    private SpriteBatch batch;
    private static final float LOAD_IMAGE_WIDTH = 480, LOAD_IMAGE_HEIGHT = 600;
    // Use whatever the loading image dimensions are.

    public LoadingScreen (MyGame game, SpriteBatch batch){
        this.game = game;
        this.batch = batch;
        viewport = new ExtendViewport(LOAD_IMAGE_WIDTH, LOAD_IMAGE_HEIGHT);
    }

    public void resize (int width, int height) {
        viewport.update(width, height, false);
        viewport.getCamera().position.set(LOAD_IMAGE_WIDTH / 2, LOAD_IMAGE_HEIGHT / 2, 0);
        viewport.getCamera().update();
    }

    public void show (){} // do nothing

    public void render (float delta) {

        if (firstFrame){
            Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
            viewport.apply();
            batch.setProjectionMatrix(viewport.getCamera().combined);
            batch.setBlendingDisabled(true);
            batch.begin();
            batch.draw(texture, 0, 0, LOAD_IMAGE_WIDTH, LOAD_IMAGE_HEIGHT);
            batch.end();
            firstFrame = false;
        } else {
            loadEverything(); 
            // Notice you don't actually render anything so what you previously drew stays on the screen.
        }
    }

    private void loadEverything(){
        // load your font, assets, prefs, etc.

        texture.dispose();
        main.setGameScreen();
    }
}